Merge branch '1067-increase-alertmanager-email-interval' into 'main'

Resolve "Increase alertmanager email interval"

Closes #1067

See merge request stackspin/stackspin!714

flux2/apps/monitoring/kube-prometheus-stack-values-configmap.yaml

@@ -45,7 +45,7 @@ data:
           group_by: ['job']
           group_wait: 30s
           group_interval: 5m
-          repeat_interval: 1h
+          repeat_interval: 6h
           receiver: email
           routes:
           - match: